. >>> there are alarming new developments involving the crisis in syria. pentagon sources tell nbc news there is specific intelligence suggesting the syrian government has loaded sarin gas, a deadly nerve agent, into aerial bombs and is awaiting command from president assad for its use. it comes as the fighting grows more intense and the rebels continue to advance into the capital city of damascus. yesterday secretary of state hillary clinton repeated her warning that the u.s. is ready to take swift action. >> our concerns are that increasingly desperate assad regime might turn to chemical weapons or might lose control of them to one of the many groups that are now operating within syria. we have sent an unmistakable message that this would cross a red line. and those responsible would be held to account. >> u.s. officials stress the chemical bonds remain in storage depots and president assad has not issued any warning to use them. egypt is going into political turmoil after intense clashes on the doorstep of the presidential palace. it's the largest confr